National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

67°F

19°C

Humidity 57%
Wind Speed SE 6 mph
Barometer 30.01 in (1016.1 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Last update 10 Oct 7:53 pm CDT
Extended Forecast for

Affton MO

  • Tonight

    Tonight: Partly cloudy, with a low around 55. Southeast wind around 5 mph becoming calm in the evening.

    Low: 55 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 88. Calm wind.

    High: 88 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 65. South wind 3 to 5 mph.

    Low: 65 °F

    Partly Cloudy

  • Columbus Day

    Columbus Day: Sunny, with a high near 95. Southwest wind 5 to 10 mph.

    High: 95 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 71. Southwest wind 6 to 8 mph.

    Low: 71 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 92.

    High: 92 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 70.

    Low: 70 °F

    Mostly Clear
    then Chance
    Showers

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 84. Chance of precipitation is 80%.

    High: 84 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers likely, with thunderstorms also possible after 1am. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.

    Low: 65 °F

    Showers
    Likely

Detailed Forecast

Tonight
Partly cloudy, with a low around 55. Southeast wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 88. Calm wind.
Sunday Night
Partly cloudy, with a low around 65. South wind 3 to 5 mph.
Columbus Day
Sunny, with a high near 95. Southwest wind 5 to 10 mph.
Monday Night
Clear, with a low around 71. Southwest wind 6 to 8 mph.
Tuesday
Sunny, with a high near 92.
Tuesday Night
A 40 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 70.
Wednesday
Showers and possibly a thunderstorm. High near 84. Chance of precipitation is 80%.
Wednesday Night
Showers likely, with thunderstorms also possible after 1am. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.
Thursday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 79. Chance of precipitation is 60%.
Thursday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 58.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 71.
Friday Night
Partly cloudy, with a low around 48.
Saturday
Mostly sunny, with a high near 64.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Affton MO
 38.56°N 90.32°W (Elev. 564 ft)
Last Update:
7:46 pm CDT Oct 10, 2026
Forecast Valid:
7pm CDT Oct 10, 2026-6pm CDT Oct 17, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation